4*(x-5)=48
4x-20=48
4x=68
x=68/4
x=17
<span>7:( 1 1/5 - 2,2 ) + 1/10 : ( 2,8 - 3/8 ) = 7:(6/5-22/10) + 1/10 : (28/10-3/8) = 7 : (12/10-22/10) + 1/10: (112/40 - 15/40) = 7 : (-1) + 1/10: ( 97/40) = -7 + 1/10*40/97 = -7 + 4/97 = -6 97/97 + 4/97 = -6 93/97</span>
Log₀,₀₁X=-3/2
log₁₀⁻²X=-3/2
-(1/2)*log₁₀X=-3/2
log₁₀X=3
x=10³
x=1000
3=100%
1%=3:100=0,03
4:0,03=133
Ответ: на 33%